Amazon-owned Whole Foods is asking the National Labor Relations Board to set aside the results of a union election that led to a labor win.

The specialty grocer filed objections to the NLRB claiming the UFCW Local 1776 “illegally interfered” with its staffers’ “fair right to vote.”

The union win, at a Philadelphia store where workers are seeking higher wages, comes as Amazon is also fighting organizing efforts among some warehouse employees and delivery drivers.

Last month, workers at a Whole Foods store in Philadelphia voted in favor of joining the United Food and Commercial Workers Union.